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To determine the proportion of patients whose plasma HIV-1 RNA level falls below the level of detection (< 400 copies/ml) at week 24 of study therapy. To determine the absolute change in plasma HIV-1 RNA during the 24 weeks of study treatment. To collect safety data on the treatment regimens.

NOTE: "New RTI" is defined for this study as any reverse transcriptase inhibitor to which the patient has never been exposed.

AS PER AMENDMENT 12/12/97: In this open-label, multicenter, Phase IIIB, comparative study, 825 patients are randomized to treatment arms. (NOTE: 50% of the patients will be treatment naive and 50% will be NRTI experienced.) Further, patients are randomized with stratification based on HIV-1 RNA level (5,000-30,000 copies/ml vs. greater than 30,000 copies/ml) and prior antiretroviral therapy to one of the three study arms.

NRTI experienced patients in Arms A & B should be treated with 2 NRTIs to which he/she has not been previously exposed. If the patient has only 1 NRTI to which he/she has never been exposed, then the second NRTI can be one that the patient has been previously exposed to from the most distant past.

Therapy is administered for an initial 24 weeks and may be extended for an additional 24 weeks.

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Ages Eligible for Study:

16 Years and older (Child, Adult, Senior)

Sexes Eligible for Study:

All

Accepts Healthy Volunteers:

No

Criteria

Inclusion Criteria

Patients must have:

HIV-1 infection.

HIV RNA >= 5000 copies/ml by Amplicor assay.

Signed, informed consent from parent or legal guardian for patients less than 18 years old.